JP2022021125A - Work vehicle - Google Patents

Abstract

To provide a work vehicle capable of making it difficult for a work object to remain in a bucket and capable of sufficiently peeling out a work object remaining in the bucket even when handling a work object with high viscosity.SOLUTION: In a wheel loader 1 comprising a bucket 22, in a rea face portion 223 of the bucket 22, first to fourth penetration holes 223A to 223D penetrating the bucket 22 are formed, and first to fourth plates 3A to 3D having a weight required to add impact force to a work object in the bucket 22 are attached to an outer face 223X so as to face the first to fourth penetration holes 223A to 223D. The first to fourth plates 3A to 3D can rotate around first to fourth support pins 5A to 5D. During a dumping operation of the bucket 22, on end portion opposite to the other end portion provided with the first to fourth support pins 5A to 5D protrudes toward an inside of the bucket 22 via the first to fourth penetration holes 223A to 223D.SELECTED DRAWING: Figure 8

Description

The present invention relates to a work vehicle provided with a bucket for scooping a work object and discharging it to a loading destination.

A work vehicle such as a wheel loader excavates work objects such as earth and sand and minerals using a bucket, and carries out cargo handling work in which the work objects loaded in the bucket are loaded into a loading destination such as a dump truck or a hopper. Here, when the work vehicle handles a highly viscous work object such as mud, clay, or compost, the work object may stick to a corner portion in the bucket and remain. When the work object remaining in the bucket is accumulated, the capacity of the load that can be loaded in the bucket is reduced and the work efficiency is lowered.

Therefore, for example, Patent Document 1 is a bucket device in which a container-shaped bucket body having an opening for storing and carrying out a transported object is provided in a working device so as to be able to move up and down and to rotate up and down. , A plurality of through holes for air supply are provided near the bottom corner of the bucket body, and the plurality of through holes are closed by an external force from the contents moving when the transported object is stored in the bucket body. A configuration is disclosed in which a movable plate having a movable plate for supplying air by opening a through hole at the time of discharging a transported object with the opening of the bucket body facing downward is provided. With this configuration, the air supplied into the bucket body from the through hole enters between the contents and the bucket body, and the contents are easily separated from the bucket body.

Japanese Patent No. 4050651

However, in the bucket device described in Patent Document 1, since the movable plate is provided inside the bucket body, in the case of highly viscous contents, the friction between the bucket device and the inner surface of the bucket body becomes large. The movable plate becomes difficult to rotate. Further, since the hinge that is the center of rotation of the movable plate is covered with a highly viscous content, the movable plate may not be able to rotate.

Therefore, an object of the present invention is to make it difficult for the work object to remain in the bucket even when handling a highly viscous work object, and to sufficiently peel off the work object remaining in the bucket. Is to provide a work vehicle capable of.

In order to achieve the above object, the present invention is in a work vehicle provided with a bucket in front of the vehicle body for scooping and discharging the work object, the bucket having an opening through which the work object is loaded and discharged. A pair of side surface portions facing each other at intervals of the width of the opening in the width direction of the vehicle body, and a back surface portion connecting the pair of side surface portions on the side facing the opening, are in contact with the vehicle body. It has a bottom surface portion extending from the back surface portion toward the opening on the ground side, and a top surface portion extending from the back surface portion toward the opening on the side facing the bottom surface portion. It is formed in the shape of a container on which a work object can be stacked, and a through hole that penetrates the inside and outside of the bucket is formed on the back surface thereof, and is predetermined for the work object in the bucket. A heavy plate is attached to the outer surface so as to face the through hole, and the plate is centered on a support pin whose one end is attached to the top surface side or the bottom surface side and extends in the width direction of the vehicle body. It is characterized in that it is rotatably provided with respect to the back surface portion, and the other end portion is provided so as to be rotatable toward the inside of the bucket through the through hole during the dump operation of the bucket.

According to the present invention, even when handling a highly viscous work object, it is difficult for the work object to remain in the bucket, and the work object remaining in the bucket can be sufficiently peeled off. .. Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

It is an external side view which shows one configuration example of the wheel loader which concerns on embodiment of this invention. It is a front perspective view of a bucket. It is a rear perspective view of a bucket. It is a rear view of a bucket. It is a left side view of a bucket. FIG. 5 is an enlarged view of part X in FIG. It is a left side view which shows the state of a plate in a horizontal posture of a bucket. It is a left side view which shows the state of a plate at the time of a dump operation of a bucket. It is a perspective view which shows one structural example of the plate and the closed plate which concerns on the modification of this invention. It is a perspective view which shows a part of the front surface of a bucket in a modification. It is a left side view which shows the mounting state of a plate and a closing plate in a modification.

Hereinafter, as one aspect of the work vehicle according to the embodiment of the present invention, for example, a wheel loader for excavating earth and sand and minerals and loading them into a dump truck, a hopper, or the like will be described.

<Overall configuration of wheel loader 1>
First, the overall configuration of the wheel loader 1 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 1 is an external side view showing a configuration example of the wheel loader 1 according to the embodiment of the present invention.

The wheel loader 1 is an articulated work vehicle that is steered by bending the vehicle body near the center. Specifically, the front frame 1A, which is the front part of the vehicle body, and the rear frame 1B, which is the rear part of the vehicle body, are rotatably connected to each other by the center joint 10 in the left-right direction, and the front frame 1A is connected to the rear frame 1B. On the other hand, it bends in the left-right direction. In the following description, of the left and right width directions (vehicle width direction) of the vehicle body, the left-hand side when facing the front side in the traveling direction is referred to as "left direction", and the opposite right-hand side is referred to as "right direction". ".

Four wheels 11 are provided on the vehicle body, two wheels 11 are provided on the left and right sides of the front frame 1A as front wheels 11A, and the remaining two wheels 11 are provided on both left and right sides of the rear frame 1B as rear wheels 11B. ing. Note that FIG. 1 shows only the left front wheel 11A and the rear wheel 11B among the pair of left and right front wheels 11A and rear wheels 11B.

A work device 2 used for cargo handling work is attached to the front portion of the front frame 1A. The working device 2 includes a lift arm 21 having a base end attached to the front frame 1A, two lift arm cylinders (not shown) for driving the lift arm 21, and a bucket 22 attached to the tip of the lift arm 21. A bucket cylinder 22A for driving the bucket 22 and a bell crank 23 rotatably connected to the lift arm 21 to form a link mechanism between the bucket 22 and the bucket cylinder 22A. In FIG. 1, both the bucket cylinder 22A and the bell crank 23 are shown by a two-dot chain line.

The lift arm 21 is driven by supplying hydraulic oil to each of the two lift arm cylinders and expanding and contracting each rod. Specifically, the lift arm 21 rotates upward with respect to the front frame 1A by extending each rod, and rotates downward with respect to the front frame 1A by contracting each rod. In FIG. 1, the state in which the lift arm 21 has risen to the limit with respect to the front frame 1A is shown by a solid line, and the state in which the lift arm 21 has fallen to the limit with respect to the front frame 1A is shown by a two-dot chain line.

The bucket 22 is a work tool for scooping work objects such as earth and sand and minerals and discharging them to a loading destination such as a dump truck or a hopper. Hydraulic oil is supplied to the bucket cylinder 22A and a rod 220A (2 in FIG. 1). (Indicated by the dotted line) is driven by expansion and contraction. Specifically, the bucket 22 rotates (tilts) upward with respect to the lift arm 21 as the rod 220A extends, and rotates downward (dumps) with respect to the lift arm 21 as the rod 220A contracts. )do. That is, the bucket 22 scoops the work object by the tilt operation, and discharges the scooped work object (load) by the dump operation.

In addition, in FIG. 1, the state when the bucket 22 performs the tilt operation in each of the state where the lift arm 21 is raised to the limit with respect to the front frame 1A and the state where the lift arm 21 is lowered to the limit with respect to the front frame 1A is shown. It is shown by a dotted line, and the state when the bucket 22 performs a dump operation in a state where the lift arm 21 is raised to the limit with respect to the front frame 1A is shown by a solid line. Further, a two-dot chain line shows a state in which the lift arm 21 descends with respect to the front frame 1A and the bucket 22 comes into contact with the ground, and a state in which the bucket 22 tilts from that state.

The rear frame 1B includes a driver's cab 12 on which an operator rides, a machine room 13 that houses equipment necessary for driving a wheel loader 1 such as an engine and a hydraulic pump, and a work device 2 so that the vehicle body does not tilt. A counterweight 14 for maintaining balance is provided. In the rear frame 1B, the driver's cab 12 is arranged on the front side, the counterweight 14 is arranged on the rear side, and the machine room 13 is arranged between the driver's cab 12 and the counterweight 14.

<Structure of bucket 22>
Next, a specific configuration of the bucket 22 will be described with reference to FIGS. 2 to 6.

FIG. 2 is a front perspective view of the bucket 22. FIG. 3 is a rear perspective view of the bucket 22. FIG. 4 is a rear view of the bucket 22. FIG. 5 is a left side view of the bucket 22. FIG. 6 is an enlarged view of part X in FIG.

The bucket 22 faces the opening 220 in which the work object is loaded and discharged, a pair of side surface portions 221,222 facing each other with a space corresponding to the width of the opening 220 in the vehicle width direction, and the opening 220. A back surface portion 223 connecting a pair of side surface portions 221 and 222 on the side, a bottom surface portion 224 extending from the back surface portion 223 toward the opening 220 on the ground contact surface side of the vehicle body, and a rear surface portion on the side facing the bottom surface portion 224. It has a top surface portion 225 extending from the portion 223 toward the opening 220.

Therefore, the bucket 22 is formed in a container shape capable of loading a work object in an internal space surrounded by a pair of side surface portions 221 and 222, a back surface portion 223, a bottom surface portion 224, and a top surface portion 225. Of the pair of side surface portions 221 and 222, the side surface portion arranged in the left direction of the vehicle body is referred to as "left side surface portion 221", and the side surface portion arranged in the right direction of the vehicle body is referred to as "right side surface portion 222".

As shown in FIG. 2, the opening 220 is formed in a horizontally long rectangular shape having a long side in the vehicle width direction, and faces diagonally forward and upward when the bucket 22 is tilted, and is forward when the bucket 22 is dumped. Point diagonally downward. Further, when the bucket 22 is thrust into, for example, a ground in order to excavate a work object, the bucket 22 keeps the bottom surface portion 224 in contact with the ground, but at this time, the opening portion 220 faces forward. do. The posture of the bucket 22 with the opening 220 facing forward is referred to as a “horizontal posture”.

As shown in FIGS. 2, 3, and 5, the back surface portion 223 is curved in an arc shape toward the side opposite to the opening portion 220 in the present embodiment. Further, as shown in FIG. 5, the opening 220 which is the entrance / exit of the bucket 22 is formed to be larger than the back surface portion 223 side which is the inner side of the bucket 22. Therefore, the bottom surface portion 224 is inclined diagonally downward from the back surface portion 223 side toward the opening 220 side, and the top surface portion 225 is inclined diagonally upward from the back surface portion 223 side toward the opening 220 side. As a result, the bucket 22 has a structure in which it is easy to put the work object inside and to discharge the work object from the inside.

Here, when the work object handled by the wheel loader 1 is a highly viscous (sticky) object such as mud, clay, or compost, the work object put into the bucket 22 sticks to the corner portion. And may remain. In particular, the work object tends to remain in the connection portion between the left side surface portion 221 and the back surface portion 223 and the connection portion between the right side surface portion 222 and the back surface portion 223.

Therefore, as shown in FIG. 2, four first to fourth through holes 223A to 223D penetrating the inside and outside of the bucket 22 are formed on the back surface portion 223 of the bucket 22. As a result, air is supplied into the bucket 22 through the first to fourth through holes 223A to 223D, and air enters between the fixed work object and the inner surface of the bucket 22, so that the inner surface of the bucket 22 The work object is easily peeled off. In the present embodiment, the first to fourth through holes 223A to 223D each have a short side in the vehicle width direction, and are elongated rectangular shapes formed along the curved surface of the back surface portion 223.

Further, on the back surface portion 223, as shown in FIGS. 3 and 4, four first to fourth plates 3A to 3D are provided on the outer surface 223X so as to face each of the first to fourth through holes 223A to 223D. It is attached to. The first to fourth plates 3A to 3D each have a short side in the vehicle width direction corresponding to the shapes of the first to fourth through holes 223A to 223D, and have an elongated shape along the curved surface of the back surface portion 223. The work object in the bucket 22 is formed in such a size that it does not spill from the first to fourth through holes 223A to 223D.

In this embodiment, as shown in FIG. 2, the first to fourth through holes 223A to 223D and the first to fourth plates 3A to 3D are each the top T of the back surface portion 223 (indicated by the alternate long and short dash line in FIG. 2). It is arranged in the area on the top surface portion 225 side.

Of the first to fourth through holes 223A to 223D, the first through hole 223A and the second through hole 223B are at the right end of the back surface portion 223, and the third through hole 223C and the fourth through hole 223D are at the back surface portion 223. They are arranged in pairs at the left end of each. The first to fourth through holes 223A to 223D are arranged in the order of the first through hole 223A, the second through hole 223B, the third through hole 223C, and the fourth through hole 223D from the right side to the left side of the bucket 22. I'm out.

As shown in FIGS. 3 and 4, in the first to fourth plates 3A to 3D, the first plate 3A and the second plate 3B have the back surface portion 223 so as to correspond to the first to fourth through holes 223A to 223D. The third plate 3C and the fourth plate 3D are arranged in pairs at the left end portion of the back surface portion 223 at the right end portion of the above. Then, similarly to the first to fourth through holes 223A to 223D, the first plate 3A, the second plate 3B, the third plate 3C, and the fourth plate 3D are arranged in this order from the right side to the left side of the bucket 22. ..

In the back surface portion 223, between the second through hole 223B and the third through hole 223C, a pair of lift arm connection piece units 41A and 41B to which the left and right side plates of the lift arm 21 are connected, and a bell crank. A bell crank connection piece unit 42 to which the 23 is connected is provided. The bell crank connection piece unit 42 is arranged between the pair of lift arm connection piece units 41A and 41B.

Therefore, in other words, in the back surface portion 223, the first through hole 223A and the second through hole 223B are on the right side of the right lift arm connection piece unit 41A, and the third through hole 223C and the fourth through hole 223D are on the left side. It is formed on the left side of the connection piece unit 41B for the lift arm of the above.

The positions of the first to fourth through holes 223A to 223D on the back surface portion 223 are not particularly limited, but as described above, they are located on the left and right ends of the bucket 22 where the work object tends to remain. It is desirable to be there. Further, the back surface portion 223 does not necessarily have to be formed with four first to fourth through holes 223A to 223D, and the number of through holes is not particularly limited. Therefore, the number of plates and the mounting position on the back surface portion 223 are not particularly limited, and may be mounted corresponding to the through holes.

The first to fourth plates 3A to 3D are attached to the back portion 223 via the first to fourth support pins 5A to 5D which are attached to one end on the top surface portion 225 side in the long side direction and extend in the vehicle width direction, respectively. On the other hand, it is rotatably attached in the thickness direction. That is, in each of the first to fourth plates 3A to 3D, one end in the long side direction is attached to the top surface portion 225 side and extends in the vehicle width direction, and the back portion is centered on the first to fourth support pins 5A to 5D. It is rotatably provided with respect to 223. Insertion holes 300 (see FIGS. 6 and 7) through which the first to fourth support pins 5A to 5D are inserted penetrate through the one ends of the first to fourth plates 3A to 3D in the short side direction, respectively. It is formed. Then, in each of the first to fourth plates 3A to 3D, the other end of the bottom surface portion 224 side in the long side direction is rotated so as to draw an arc with the first to fourth support pins 5A to 5D as the center (fulcrum). Move.

When the first to fourth plates 3A to 3D rotate in the direction approaching the back surface portion 223, the other end portions of the first to fourth plates 3A to 3D in the long side direction penetrate the first to fourth plates, respectively. It projects inward of the bucket 22 through the holes 223A to 223D. In other words, the other ends of the first to fourth plates 3A to 3D in the long side direction are directed toward the inside of the bucket 22 through the first to fourth through holes 223A to 223D during the dump operation of the bucket 22. It is provided so that it can be projected freely. Therefore, the lateral widths (lengths in the short side direction) of the first to fourth plates 3A to 3D are set smaller than the lateral widths of the first to fourth through holes 223A to 223D, respectively.

That is, the first to fourth plates 3A to 3D do not completely block the first to fourth through holes 223A to 223D, and the first to fourth plates 3A to 3D and the first to fourth through holes 223A to With 223D, gaps are formed on both sides in the short side direction. If the gap is too large, the work object in the bucket 22 tends to spill to the back surface portion 223 side through this gap, so that the gap is in the long side direction of the first to fourth plates 3A to 3D. The end is set to the minimum size so that it can protrude into the bucket 22.

At the right end of the back surface 223, three first to third brackets 43A to 43C projecting from the outer surface 223X are provided side by side at equal intervals in the vehicle width direction. The first to third brackets 43A to 43C are arranged in the order of the first bracket 43A, the second bracket 43B, and the third bracket 43C from the right side to the center side of the bucket 22.

Then, the first plate 3A is arranged between the first bracket 43A and the second bracket 43B, and the first support pin 5A is attached from the first bracket 43A to the second bracket 43B. Further, the second plate 3B is arranged between the second bracket 43B and the third bracket 43C, and the second support pin 5B is attached from the second bracket 43B to the third bracket 3C.

Similarly, at the left end portion of the back surface portion 223, three fourth to sixth brackets 43D to 43F projecting from the outer surface 223X are provided side by side at equal intervals in the vehicle width direction. The fourth to sixth brackets 43D to 43F are arranged in the order of the sixth bracket 43F, the fifth bracket 43E, and the fourth bracket 43D from the left side to the center side of the bucket 22.

Then, the third plate 3C is arranged between the fourth bracket 43D and the fifth bracket 43E, and the third support pin 5C is attached from the fourth bracket 43D to the fifth bracket 43E. Further, the fourth plate 3D is arranged between the fifth bracket 43E and the sixth bracket 43F, and the fourth support pin 5D is attached from the fifth bracket 43E to the sixth bracket 43F.

In the present embodiment, the first to fourth engaging units 44A to 44D are engaged with the outer surface 223X of the back surface portion 223 by the other end of the first to fourth plates 3A to 3D on the bottom surface portion 224 side in the longitudinal direction. Are provided respectively. Since the first to fourth engaging units 44A to 44D all have the same configuration, the fourth engaging unit 44D will be taken as an example and will be described with reference to FIG.

As shown in FIG. 6, at the other end of the fourth plate 3D, an extension portion 30 extending toward the bottom surface portion 224 side from the fourth through hole 233D is provided, and the extension portion 30 is the first. 4 Engages with the engagement unit 44D.

The fourth engaging unit 44D has a collision surface portion 441 on which the extension portion 30 collides with the fourth plate 3D when the fourth plate 3D rotates in a direction approaching the back surface portion 223 about the fourth support pin 5D, and the fourth plate 3D. To fix the stopper portion 442 to which the extension portion 30 abuts, the collision surface portion 441 and the stopper portion 442 to the back surface portion 223 when the fourth support pin 5D is rotated in a direction away from the back surface portion 223. It has a tool 443 and.

The collision surface portion 441 and the stopper portion 442 are each formed of a rectangular plate member, and are arranged side by side at intervals in the thickness direction of the back surface portion 223. Specifically, the collision surface portion 441 is arranged on the back surface portion 223 side, and the extension portion 30 is engaged between the collision surface portion 441 and the stopper portion 442 via a gap. In the present embodiment, the fixture 443 is two bolts arranged along the back surface portion 223, but the fixing means is not particularly limited.

<Movement of 1st to 4th plates 3A to 3D>
Next, the movements of the first to fourth plates 3A to 3D accompanying the operation of the bucket 22 will be described with reference to FIGS. 7 and 8 by taking the fourth plate 3D as an example.

FIG. 7 is a left side view showing the state of the fourth plate 3D when the bucket 22 is in the horizontal posture. FIG. 8 is a left side view showing the state of the fourth plate 3D during the dump operation of the bucket 22.

As shown in FIG. 7, when the bucket 22 is in the horizontal posture, the surface of the fourth plate 3D facing the fourth through hole 223D is the same as the inner surface of the back surface portion 223. To position. At this time, the extending portion 30 is located between the collision surface portion 441 and the stopper portion 442, and is in a state of not touching either the collision surface portion 441 or the stopper portion 442.

Then, as shown in FIG. 8, when the bucket 22 performs a dump operation, the fourth plate 3D rotates around the fourth support pin 5D in a direction approaching the back surface portion 223, and the extension portion 30 The upper front side of the bucket 22 projects toward the inside of the bucket 22 through the fourth through hole 223D. The fourth plate 3D has a predetermined weight, and in the present embodiment, it is made of the same steel material as the bucket 22. The predetermined weight of the fourth plate 3D corresponds to, for example, the weight required to apply an impact force to the work object in the bucket 22, and is arbitrary according to the specifications of the bucket 22 and the type of the work object. It is possible to change to.

In this way, during the dump operation of the bucket 22, the other end of the bottom surface portion 224 side of the fourth plate 3D protrudes into the bucket 22 from the fourth through hole 223D, so that the work object in the bucket 22 is subjected to. It can give a momentary impact force. As a result, an impact is applied to the surface of the work object to be fixed to the back surface portion 223, and the work object is likely to be peeled off from the inner surface of the back surface portion 223.

In the wheel loader 1, by supplying air into the bucket 22 through the fourth through hole 223D, an air layer is formed between the work object and the inner surface of the back surface portion 223, and the work object is placed on the back surface portion. Not only is it easy to peel off from the 223, but in addition, the work object is pushed out by applying an impact force to the work object using the 4th plate 3D, thereby promoting the peeling of the work object from the back surface 223. is doing. Therefore, even when handling a highly viscous work object, it is possible to make it difficult for the work object to remain in the bucket 22 and to sufficiently peel off the work object remaining in the bucket 22. ..

Further, as described above, the fourth plate 3D is formed vertically along the back surface portion 223, and the center of gravity is located below the central position in the long side direction. As a result, the moment arm protruding into the bucket 22 through the fourth through hole 223D can be taken for a long time, and an impact force can be easily applied to the work object by using the principle of the lever.

In the present embodiment, as shown in FIG. 8, in the fourth plate 3D, the other end portion on the bottom surface portion 224 side protrudes into the bucket 22 from the fourth through hole 223D, and at the same time, the extension portion 30 extends to the collision surface portion 441. collide. As a result, the impact force applied to the work object by the fourth plate 3D becomes large, and the work object is more likely to peel off from the inner surface of the back surface portion 223.

Further, in the present embodiment, since the fourth plate 3D is arranged in the region on the top surface portion 225 side of the top surface portion T of the back surface portion 223 (see FIG. 2), the work object is set during the dump operation of the bucket 22. It can be pushed out from diagonally upper rear to diagonally lower front (direction toward the opening 220), and the peeling of the work object from the back surface 223 is further promoted.

When the bucket 22 tilts, the fourth plate 3D rotates in a direction away from the back surface portion 223 about the fourth support pin 5D. At this time, in the present embodiment, the extending portion 30 is a stopper portion. The rotation width is restricted by abutting on the 442. This rotation width is set so that when the fourth plate 3D rotates in a direction away from the back surface portion 223 and the fourth through hole 223D is opened, the work object does not spill from the opened portion.

In the present embodiment, the fourth plate 3D has a configuration in which one end on the top surface portion 225 side is supported by the fourth support pin 5D and the other end portion on the bottom surface portion 224 side rotates in the thickness direction of the back surface portion 223. However, the present invention is not limited to this, even if the other end portion on the bottom surface portion 224 side is supported by the fourth support pin 5D and one end portion on the top surface portion 225 side rotates in the thickness direction of the back surface portion 223. good. In that case, since the impact force can be applied to the work object from diagonally upper rear to diagonally lower front, the impact force becomes large.

<Modification example>
Next, the configuration of the wheel loader 1 according to the modified example will be described with reference to FIGS. 9 to 11. In FIGS. 9 to 11, the components common to those described for the wheel loader 1 according to the embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 9 is a perspective view showing a configuration example of the plate 3 and the closed plate 6 according to the modified example of the present invention. FIG. 10 is a perspective view showing a part of the front surface of the bucket 22 in the modified example. FIG. 11 is a left side view showing the mounting state of the plate 3 and the closed plate 6 in the modified example.

As shown in FIG. 10, the wheel loader 1 according to this modification is formed to be larger than the first to fourth through holes 223A to 223D, and the first to fourth through holes 223A to 223D are formed from the inside of the bucket 22, respectively. It is further provided with a closing plate 6 for closing. Note that FIG. 10 shows only the closing plate 6 that closes the first through hole 223A and the second through hole 223B among the first to fourth through holes 223A to 223D. Further, in the following, the "first to fourth through holes 223A to 223D" are simply referred to as "through holes 223H", and the "first to fourth plates 3A to 3D" are simply referred to as "plate 3".

As shown in FIG. 9, the closing plate 6 is curved in an arc shape along the shape of the back surface portion 223 of the bucket 22. Then, as shown in FIG. 11, the closed surface 61, which is a surface facing the inner surface 223Y and the through hole 223H of the back surface portion 223, attaches an adhesive means such as welding to the facing surface 31 of the plate 3 with the through hole 223H. It is fixed using. The integrated plate 3 and the closing plate 6 are assembled from the opening 220 side of the bucket 22.

Since the closing surface 61 of the closing plate 6 needs to close the through hole 223H, both the long side and the short side are set to have a longer dimension than the through hole 223H. On the other hand, since the facing surface 31 of the plate 3 projects into the bucket 22 through the through hole 223H during the dump operation of the bucket 22, both the long side and the short side are set to have a shorter dimension than the through hole 223H. There is.

As shown in FIG. 11, when the bucket 22 is tilted, the closing surface 61 (specifically, a region of the closing surface 61 protruding outward from the through hole 223H) comes into contact with the inner surface 223Y of the bucket 22 (specifically, a region of the closing surface 61 protruding outward from the through hole 223H). Contact). There is a possibility that the work object may spill out from the slight gap formed between the plate 3 and the through hole 223H, but the closing surface 61 of the closing plate 6 covers and closes the entire through hole 223H. , It is possible to prevent the work object from spilling from the gap.

Further, during the dump operation of the bucket 22, the closing plate 6 is pushed out toward the opening 220 as the plate 3 protrudes into the bucket 22. As a result, the closing surface 61 of the closing plate 6 protrudes toward the opening 220 side away from the inner surface 223Y of the back surface portion 223. At this time, since the work object in the bucket 22 is pushed out toward the opening 220 by the closing plate 6, the work object is further peeled off from the back surface portion 223.

In this modification, the mounting position of the plate 3 is set higher than the mounting position of the plate 3 according to the embodiment. Specifically, the plate 3 is attached to the outer surface 223X of the back surface portion 223 so that the position of the center of rotation, that is, the position of the support pin 5 is above the through hole 223H. If the mounting position of the plate 3 according to this modification is the same as the mounting position of the plate 3 according to the embodiment, the closing plate 6 moves due to the relationship between the position of the center of rotation and the position of the through hole 223H. Since it disappears, such a situation is avoided by changing the mounting position of the plate 3.

The embodiments and modifications of the present invention have been described above. The present invention is not limited to the above-described embodiments and modifications, and includes various other modifications. For example, the above-described embodiments and modifications have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to replace a part of the configuration of the present embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of the present embodiment. Furthermore, it is possible to add / delete / replace a part of the configuration of the present embodiment with another configuration.

For example, in the above-described embodiment and modification, the extension portion 30 is provided at the other end of each of the first to fourth plates 3A to 3D, but the extension portion 30 does not necessarily have to be provided. do not have.

Further, in the above-described embodiment and modification, the first to fourth engaging units 44A to 44D are provided on the outer surface 223X of the back surface portion 223 of the bucket 22, but the first to fourth engaging units 44A to 44D are not necessarily provided. Does not have to be provided.

Further, in the above-described embodiment and modification, the back surface portion 223 of the bucket 22 is curved toward the vehicle body side, and the first to fourth plates 3A to 3D are on the top surface portion 225 side of the top surface T of the back surface portion 223. However, the back surface portion 223 does not necessarily have to be curved, and the positions of the first to fourth plates 3A to 3D are also the first to fourth through holes 223A in the back surface portion 223. There is no particular limitation as long as it corresponds to the position of ~ 223D.

Further, in the above-described embodiment and modification, the wheel loader 1 has been described as an example of the work vehicle, but the present invention is not limited to this, and the present invention is used as long as the work vehicle is provided with the bucket 22 in front of the vehicle body. It is possible to apply.

1: Wheel loader (working vehicle)
3,3A-3D: 1st-4th plates (plates)
5A-5D: 1st to 4th support pins 6: Blocking plate 22: Bucket 30: Extension 31: Facing surface 61: Blocking surface 220: Opening 221: Left side surface 222: Right side surface 223: Back surface 223A to 223D , 223H: 1st to 4th through holes (through holes)
223X: Outer surface 223Y: Inner surface 224: Bottom surface 225: Top surface 441: Collision surface 442: Stopper T: Top

Claims (5)

In a work vehicle equipped with a bucket in front of the vehicle body that scoops and discharges work objects
The bucket is
An opening into which the work object is loaded and discharged, and
A pair of side surface portions facing each other at intervals of the width of the opening in the width direction of the vehicle body,
A back surface portion connecting the pair of side surface portions on the side facing the opening portion, and a back surface portion.
A bottom surface portion extending from the back surface portion toward the opening portion on the ground contact surface side of the vehicle body, and a bottom surface portion.
It has a top surface portion extending from the back surface portion toward the opening on the side facing the bottom surface portion, and is formed in a container shape capable of loading the work object inside.
On the back part,
A through hole is formed through the inside and outside of the bucket, and a plate having a predetermined weight for the work object in the bucket is attached to the outer surface so as to face the through hole.
The plate is
One end portion is rotatably provided with respect to the back surface portion around a support pin that is attached to the top surface portion side or the bottom surface portion side and extends in the width direction of the vehicle body.
A work vehicle characterized in that the other end portion is provided so as to be able to project into the bucket through the through hole during a dump operation of the bucket. In the work vehicle according to claim 1,
At the other end of the plate,
An extension portion extending from the through hole to the top surface portion side or the bottom surface portion side is provided.
On the outer surface of the back surface,
A work vehicle provided with a collision surface portion on which the extension portion collides with the plate when the plate rotates in a direction approaching the back surface portion around the support pin during the dump operation. In the work vehicle according to claim 2,
On the outer surface of the back surface,
A work vehicle provided with a stopper portion with which the extension portion abuts when the plate rotates in a direction away from the back surface portion about the support pin during the tilt operation of the bucket. In the work vehicle according to claim 1,
The back surface portion is curved in an arc shape toward the side opposite to the opening portion.
A work vehicle, wherein the through hole and the plate are each arranged in a region on the top surface side of the top surface of the back surface portion. In the work vehicle according to claim 1,
Further provided with a closing plate formed larger than the through hole and closing the through hole from the inside of the bucket.
The occlusion plate is
The inner surface of the back surface portion and the closed surface facing the through hole are fixed to the facing surface of the plate with the through hole.
During the tilting operation of the bucket, the closed surface comes into contact with the inner surface.
A work vehicle characterized in that, during a dump operation of the bucket, the closed surface is separated from the inner surface and protrudes toward the opening side.

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